Michael J. Kurtz Günther Eichhorn Alberto Accomazzi Carolyn Stern-Grant Markus Demleitner Stephen S. Murray Worldwide use and impact of the NASA Astrophysics Data System digital library. 36-45 2005 56 JASIST 1 http://dx.doi.org/10.1002/asi.20095 db/journals/jasis/jasis56.html#KurtzEASDM05